Chapter 12
Real Time Clock (RTC)
XII - 2 Overview
12.1 Overview
Real Time Clock (RTC) provides the calendar function.
Table:12.1.1 shows functions of RTC.
Table:12.1.1 RTC Function
Figure:12.1.1 Block Diagram of RTC
Function Description
Clock source RTC time base timer output (1 Hz)
Time display Auto calender (years with the last two digits from 00 until 99)
Adjustment for leap year
(Years ending in "00" and divisible by 4 are set as leap years.)
Two time Display mode: 12-hour clock or 24-hour clock.
Periodic interrupt 1/2-second
1-second
1-minute
1-hour
Alarm 0 interrupt Generated when specified date/hour/minute match.
Alarm 1 interrupt Generated when specified month/day/hour/minute match.
Controls
Alarm 0 interrupts.
Controls
Alarm 1 interrupts.
Alarm 0 interrupt
Alarm 1 interrupt
Periodic interrupt
Clock Counter
(second/minute/hour/date/date of week/month/year)
Controls periodic interrupts.
0.5 seconds
1 second
1 minute
1 hour
Operation
control
RTC time base timer
output (1 Hz)
RTC time base timer
output (2 Hz)
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